Answer:
The air in the soccer ball in cold weather will decrease slightly in size and it becomes flat. The air in the soccer ball in hot weather will seem flat because the low preasure leads to lower bounce in the ball.
The metal door frame in cold weather contracts and the wood contracts more in the winter. The metal door frame in hot weather thermal blowing can occur on the outer surface of the metal door frame. Hopefully that is what you were looking for have a good day.
Answer:
The new fundamental frequency will be 598.7Hz.
Explanation:
The fundamental wavelength of the sound waves in the soda bottle is given by the equation
where 
is the speed of sound, and 
is the frequency. Since 
and 
, we have
Because it is a fundamental wavelength, the length 
of the soda can must be
The length of the soda bottle is 0.173 meters.
Now, if we pour 0.030 m of water, the new length of the air cavity becomes 
Therefore, the new fundamental wavelength will be
,
which is a frequency of
Thus, the new fundamental frequency is 598.7Hz.
Resistance of the bulb is 7.5 ohms
Explanation:
- In a circuit, according to Ohm's Law, the potential difference (voltage) across an element is directly proportional to the current flowing through it.
That is, V ∝ I
⇒ V = IR, where R is the constant of proportionality called the resistance.
- Here, current, I = 0.4 A and potential difference, V = 3 V
Resistance, R = V/I = 3/0.4 = 7.5 ohms
Answer:
Em₀ = 245 J
Explanation:
We can solve this problem with the concepts of energy conservation, we assume that there is no friction with the air.
Initial energy the highest point
Em₀ = U
Em₀ = m g h
The height can be found with trigonometry
The length of the pendulum is L and the length for the angle of 60 ° is L ’, therefore the height from the lowest point is
h = L - L’
cos θ = L ’/ L
L ’= L cos θ
h = L (1 - cos θ)
We replace
Em₀ = m g L (1- cos θ)
Let's calculate
Em₀ = 10 9.8 5.0 (1 - cos 60)
Em₀ = 245 J
